Use custom kerberos to reduce size (#9910)

* add custom kerberos

* fix kerberos and consolidate ignores

extensions/mssql/extension.webpack.config.js

@@ -15,6 +15,6 @@ module.exports = withDefaults({
 		main: './src/main.ts'
 	},
 	externals: {
-		kerberos: "commonjs kerberos"
+		'ads-kerberos': 'commonjs ads-kerberos'
 	}
 });